From cdff138c671c260527108e6771427c05f265f6a7 Mon Sep 17 00:00:00 2001
From: skidau <skidau@gmail.com>
Date: Fri, 13 Mar 2015 23:25:15 +1100
Subject: [PATCH] Show no more than one FIFO error per session.

---
 Source/Core/VideoCommon/OpcodeDecoding.cpp | 19 +++++++++++++++----
 Source/Core/VideoCommon/OpcodeDecoding.h   |  1 +
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/Source/Core/VideoCommon/OpcodeDecoding.cpp b/Source/Core/VideoCommon/OpcodeDecoding.cpp
index b7bcb8c8e3..20a8f2eac9 100644
--- a/Source/Core/VideoCommon/OpcodeDecoding.cpp
+++ b/Source/Core/VideoCommon/OpcodeDecoding.cpp
@@ -33,6 +33,7 @@
 
 
 bool g_bRecordFifoData = false;
+bool g_bFifoErrorSeen = false;
 
 static u32 InterpretDisplayList(u32 address, u32 size)
 {
@@ -77,12 +78,13 @@ static void UnknownOpcode(u8 cmd_byte, void *buffer, bool preprocess)
 {
 	// TODO(Omega): Maybe dump FIFO to file on this error
 	PanicAlert(
-	    "GFX FIFO: Unknown Opcode (0x%x @ %p, preprocessing=%s).\n"
+	    "GFX FIFO: Unknown Opcode (0x%02x @ %p, preprocessing=%s).\n"
 	    "This means one of the following:\n"
 	    "* The emulated GPU got desynced, disabling dual core can help\n"
 	    "* Command stream corrupted by some spurious memory bug\n"
 	    "* This really is an unknown opcode (unlikely)\n"
 	    "* Some other sort of bug\n\n"
+	    "Further errors will be sent to the Video Backend log and\n"
 	    "Dolphin will now likely crash or hang. Enjoy." ,
 	    cmd_byte,
 	    buffer,
@@ -123,6 +125,7 @@ static void UnknownOpcode(u8 cmd_byte, void *buffer, bool preprocess)
 
 void OpcodeDecoder_Init()
 {
+	g_bFifoErrorSeen = false;
 }
 
 
@@ -150,7 +153,12 @@ u8* OpcodeDecoder_Run(DataReader src, u32* cycles, bool in_display_list)
 			totalCycles += 6; // Hm, this means that we scan over nop streams pretty slowly...
 			break;
 
-		case GX_LOAD_CP_REG: //0x08
+		case GX_UNKNOWN_RESET:
+			totalCycles += 6; // Datel software uses this command
+			DEBUG_LOG(VIDEO, "GX Reset?: %08x", cmd_byte);
+			break;
+
+		case GX_LOAD_CP_REG:
 			{
 				if (src.size() < 1 + 4)
 					goto end;
@@ -237,7 +245,7 @@ u8* OpcodeDecoder_Run(DataReader src, u32* cycles, bool in_display_list)
 			DEBUG_LOG(VIDEO, "Invalidate (vertex cache?)");
 			break;
 
-		case GX_LOAD_BP_REG: //0x61
+		case GX_LOAD_BP_REG:
 			// In skipped_frame case: We have to let BP writes through because they set
 			// tokens and stuff.  TODO: Call a much simplified LoadBPReg instead.
 			{
@@ -283,7 +291,10 @@ u8* OpcodeDecoder_Run(DataReader src, u32* cycles, bool in_display_list)
 			}
 			else
 			{
-				UnknownOpcode(cmd_byte, opcodeStart, is_preprocess);
+				if (!g_bFifoErrorSeen)
+					UnknownOpcode(cmd_byte, opcodeStart, is_preprocess);
+				ERROR_LOG(VIDEO, "FIFO: Unknown Opcode(0x%02x @ %p, preprocessing = %s)", cmd_byte, opcodeStart, is_preprocess ? "yes" : "no");
+				g_bFifoErrorSeen = true;
 				totalCycles += 1;
 			}
 			break;
diff --git a/Source/Core/VideoCommon/OpcodeDecoding.h b/Source/Core/VideoCommon/OpcodeDecoding.h
index 5fd03e26f3..18be50eb35 100644
--- a/Source/Core/VideoCommon/OpcodeDecoding.h
+++ b/Source/Core/VideoCommon/OpcodeDecoding.h
@@ -8,6 +8,7 @@
 #include "VideoCommon/DataReader.h"
 
 #define GX_NOP                      0x00
+#define GX_UNKNOWN_RESET            0x01
 
 #define GX_LOAD_BP_REG              0x61
 #define GX_LOAD_CP_REG              0x08